scholarly journals Acclimation of soybean plants to water deficit. III Changes in leaf growth as regulated by "leaf extensibility" and pressure potential under various soil water regimes.

1987 ◽  
Vol 56 (1) ◽  
pp. 109-114
Author(s):  
Ryoichi ITOH ◽  
Atsuhiko KUMURA
Keyword(s):  
Soil Water ◽  
Water Deficit ◽  
Leaf Growth ◽  
Pressure Potential ◽  
Water Regimes ◽  
Leaf Extensibility ◽  
Soybean Plants

scholarly journals CHLORIMURON-ETHYL IN CONVENTIONAL AND TRANSGENIC SOYBEAN CULTIVARS UNDER WATER DEFICIT STRESS

2018 ◽  
Vol 31 (4) ◽  
pp. 832-842
Author(s):  
Clebson Gomes Gonçalves ◽  
Antonio Carlos da Silva Junior ◽  
Maynumi Scarano ◽  
Maria Renata Rocha Pereira ◽  
Dagoberto Martins
Keyword(s):  
Root System ◽  
Soil Water ◽  
Water Deficit ◽  
Dry Weight ◽  
Water Deficit Stress ◽  
Limiting Factor ◽  
Soybean Cultivars ◽  
Water Potentials ◽  
Chlorimuron Ethyl ◽  
Soybean Plants

ABSTRACT Water deficit is a limiting factor for the soybean yield; it triggers different physiological and anatomical adaptations that have deleterious effects on the plants and can affect the selectivity of herbicides, causing production losses. In this context, the objective of this work was to evaluate the action of the chlorimuron-ethyl herbicide when applied at different stages of soybean plants, using conventional and transgenic cultivars, and different soil water potentials. A rate of 20 g ha-1 of the chlorimuron-ethyl herbicide was applied to two soybean cultivars (MG/BR46-Conquista - conventional, and BRS-Valiosa-RR - transgenic) at two phenological stages (V2 - first fully expanded trifoliate leaves, and V4 - third fully expanded trifoliate leaves), using three soil water potentials (-0.03 MPa, -0.07 MPa, and -0.5 MPa). Phytotoxicity, and plant height were evaluated at 3, 7, 14, and 21 days after the herbicide application. The shoot dry weight, root dry weight, and root system nodulation were evaluated. The soybean plants had lower phytotoxicity when subjected to application of chlorimuron-ethyl under water deficit conditions. The use of chlorimuron-ethyl reduced the growth and biomass of soybean plants and affected the plants' root system nodulation. The transgenic cultivar (BRS-Valiosa-RR) presented better performance when subjected to a moderate water deficit (-0.07 MPa), which contributes to biological nitrogen fixation.

scholarly journals Soybean Plant Metabolism under Water Deficit and Xenobiotic and Antioxidant Agent Application

Biology ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 266
Author(s):  
Julia Renata Schneider ◽  
Mariele Müller ◽  
Vilson Antonio Klein ◽  
Luciana Grazziotin Rossato-Grando ◽  
Rômulo Pillon Barcelos ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Gas Exchange ◽  
Soil Water ◽  
Water Deficit ◽  
Water Availability ◽  
Water Status ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Antioxidant Agent ◽  
Soybean Plants

The aim was to evaluate the interactive effects on biochemistry and physiology of soybean plants exposed to simultaneous xenobiotic and water deficit stresses, and the possible attenuation of plant damage by an antioxidant agent. Soybean plants were submitted to eight different soil water potentials, in two experiments (first experiment: −0.96, −0.38, −0.07, −0.02 MPa, and second experiment: −3.09, −1.38, −0.69, −0.14 MPa), xenobiotic, and antioxidant agent applications. Was observed a reduction in water status, gas exchange, photosynthetic pigments, photosystem II quantum yield, and increased leaf temperature in plants under low water availability. Water deficit also induced oxidative stress by the increased production of reactive oxygen species, cellular and molecular damage, and induction of the antioxidant defense metabolism, reduction of gas exchange, water status, and photosynthetic efficiency. The xenobiotic application also caused changes, with deleterious effects more pronounced in low soil water availability, mainly the reactive oxygen species production, consequently the antioxidant activity, and the oxidative damages. This indicates different responses to the combination of stresses. Antioxidant enzyme activity was reduced by the application of the antioxidant agent. Principal Component Analysis showed a relation with the antioxidant agent and reactive oxygen species, which is probably due to signaling function, and with defense antioxidant system, mainly glutathione, represented by thiols.

scholarly journals Transpiration and leaf growth of potato clones in response to soil water deficit

2014 ◽  
Vol 71 (2) ◽  
pp. 96-104 ◽  
Author(s):  
André Trevisan de Souza ◽  
Nereu Augusto Streck ◽  
Arno Bernardo Heldwein ◽  
Dilson Antonio Bisognin ◽  
José Eduardo Minussi Winck ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Deficit ◽  
Leaf Growth ◽  
Soil Water Deficit

Transpiration and leaf growth of gladiolus in response to soil water deficit

2021 ◽  
Vol 283 ◽  
pp. 110031
Author(s):  
Camila Coelho Becker ◽  
Nereu Augusto Streck ◽  
Paulo Ivonir Gubiani ◽  
Lilian Osmari Uhlmann ◽  
Josana Andreia Langner ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Deficit ◽  
Leaf Growth ◽  
Soil Water Deficit

scholarly journals Water Deficit Effects on Soybean Root Morphology and Early-Season Vigor

Agronomy ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 836 ◽  
Author(s):  
Chathurika Wijewardana ◽  
F.A. Alsajri ◽  
J.T. Irby ◽  
L.J. Krutz ◽  
B.R. Golden ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Deficit ◽  
Growth And Development ◽  
Net Photosynthesis ◽  
Productivity Index ◽  
Soil Water Deficit ◽  
Soybean Plants ◽  
Effects Of Drought ◽  
Growth Habits ◽  
Stomatal Limitations

This study was conducted to determine if root, shoot, and gas exchange traits of determinate and indeterminate soybean cultivars respond differently to soil water deficit. The effect of soil water deficit imposed 4 and 10 days after sowing on growth and development parameters of determinate and indeterminate soybeans was evaluated for 18 and 30 days in experiment I and II, respectively. At both 18 and 30 days after seeding, nearly all root, shoot, and physiological parameters were inversely correlated with the soil moisture level, and the adverse effects of drought stress were more evident in Progeny P5333RY than in Asgrow AG5332. For both cultivars, the effect of soil water deficit on net photosynthesis was mainly due to stomatal limitations. The developed algorithms for the plant processes based on the environmental productivity index were not different between the cultivars, suggesting that soybean plants respond in a similar way irrespective of their growth habits, probably due to the shorter period of water stress.

scholarly journals SOIL WATER DEFICIT EFFECTS ON PLANT WATER RELATIONS AND LEAF GROWTH OF CUCUMBER

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 596c-596
Author(s):  
Jeffrey Melkonian ◽  
David W. Wolfe
Keyword(s):  
Water Potential ◽  
Soil Water ◽  
Water Deficit ◽  
Leaf Growth ◽  
Soil Water Potential ◽  
Conclusive Evidence ◽  
Soil Water Deficit ◽  
Leaf Elongation ◽  
Relative Water ◽  
And Control

Cucumber (Cucumis sativus L. cv. Marketmore 80) plants were exposed to a soil water deficit and subsequently rewatered. Maximum stress intensity was -1.5 MPa midday leaf water potential compared to -0.6 to -0.8 MPa in the well watered control, eight days after withholding water. Midday stomatal conductance {ks), leaf turgor potential and water potential decreased in the stress treatment compared to the control beginning at the first sampling, two days after withholding water. The decrease in all three was approximately linear with time over the stress. Decreased leaf elongation was observed at the second sampling, three days after the initial decline in ks and five days after withholding water. At similar relative water content {RWC), osmotic potentials of the stress and control treatments were the same throughout most of the stress. Further, there was no difference in osmotic potential, at the same RWC, between the stress and control treatments 12 - 16 hours after rewatering. Split-root experiments were also conducted to examine a possible role of a non-hydraulic signal from roots in drying soil in the regulation of ks and leaf elongation in cucumber. No conclusive evidence of a signal was found despite significant decreases in soil water potential of one-half of the root system of the stress plants. However, fluctuating vapor pressure gradients (vpg) may have obscured evidence of a signal.

scholarly journals Leaf Production and Expansion: A Generalized Response to Drought Stresses from Cells to Whole Leaf Biomass—A Case Study in the Tomato Compound Leaf

Plants ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 409 ◽  
Author(s):  
Garance Koch ◽  
Gaëlle Rolland ◽  
Myriam Dauzat ◽  
Alexis Bédiée ◽  
Valentina Baldazzi ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Deficit ◽  
Leaf Growth ◽  
Leaf Biomass ◽  
Soil Water Deficit ◽  
Cellular Mechanisms ◽  
Response Curves ◽  
Drought Duration ◽  
Leaf Production ◽  
Compound Leaf

It is clearly established that there is not a unique response to soil water deficit but that there are as many responses as soil water deficit characteristics: Drought intensity, drought duration, and drought position during plant cycle. For a same soil water deficit, responses can also differ on plant genotype within a same species. In spite of this variability, at least for leaf production and expansion processes, robust tendencies can be extracted from the literature when similar watering regimes are compared. Here, we present response curves and multi-scale dynamics analyses established on tomato plants exposed to different soil water deficit treatments. Results reinforce the trends already observed for other species: Reduction in plant leaf biomass under water stress was due to reduction in individual leaf biomass and areas whereas leaf production and specific leaf area were not affected. The dynamics of leaf expansion was modified both at the leaf and cell scales. Cell division and expansion were reduced by drought treatments as well as the endoreduplication process. Combining response curves analyses together with dynamic analyses of tomato compound leaf growth at different scales not only corroborate results on simple leaf responses to drought but also increases our knowledge on the cellular mechanisms behind leaf growth plasticity.

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